31225540015231 has 4 divisors (see below), whose sum is σ = 31225563977992. Its totient is φ = 31225516052472.

The previous prime is 31225540015207. The next prime is 31225540015273. The reversal of 31225540015231 is 13251004552213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31225540015231 - 2⁵ = 31225540015199 is a prime.

It is a super-2 number, since 2×31225540015231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31225540015931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9907041 + ... + 12672826.

It is an arithmetic number, because the mean of its divisors is an integer number (7806390994498).

Almost surely, 2^{31225540015231} is an apocalyptic number.

31225540015231 is a deficient number, since it is larger than the sum of its proper divisors (23962761).

31225540015231 is a wasteful number, since it uses less digits than its factorization.

31225540015231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23962760.

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 31225540015231 its reverse (13251004552213), we get a palindrome (44476544567444).

The spelling of 31225540015231 in words is "thirty-one trillion, two hundred twenty-five billion, five hundred forty million, fifteen thousand, two hundred thirty-one".